A5037203834- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geography and Environmental Studies
- Geochemistry and Elemental Analysis
- earthquake and tectonic studies
- Paleontology and Stratigraphy of Fossils
- Radioactive element chemistry and processing
- Minerals Flotation and Separation Techniques
- Clay minerals and soil interactions
- Metal Extraction and Bioleaching
- Iron oxide chemistry and applications
- Geochemistry and Geochronology of Asian Mineral Deposits
- Geophysical and Geoelectrical Methods
- Mining Techniques and Economics
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies Worldwide
- Landslides and related hazards
- Recycling and Waste Management Techniques
- Recycling and utilization of industrial and municipal waste in materials production
- Soil Management and Crop Yield
- Granular flow and fluidized beds
- Geological and Geophysical Studies
- Geological formations and processes
- Fish biology, ecology, and behavior
- Extraction and Separation Processes
Universidade Federal do Paraná
2009-2023
Sedimentary black shale-hosted manganese carbonate and oxide ores were studied by high-resolution in situ detailed optical cathodoluminescence microscopy, Raman spectroscopy, FTIR spectroscopy to determine microbial contribution metallogenesis. This study of the Urucum Mn deposit Brazil is included as a case for microbially mediated ore-forming processes. The results compared interpreted comparative way, data elaborated complex, structural hierarchical method. first syngenetic products...
Aripuana is a Paleoproterozoic (1.76-1.75 Ga), stratiform, volcanogenic Zn-Pb-Ag-(Au-Cu) massive sulfide deposit, has an estimated resource of 11.6 million metric tons (Mt) ore, and located on the south-southwest border Amazon craton (Brazil). resides in caldera composed strongly fractionated, felsic metavolcanic rocks, transitional between calc-alkaline tholeiitic compositions. The entire region was metamorphosed into lower greenschist facies (1.68-1.63 Ga) deposit subsequently thermally...
Neoproterozoic banded iron formations (BIF) and ironstones occur in the Urucum mining district (Pantanal, Brazil). Microbially mediated formation as microbialites has been proposed for these deposits. This study aims to provide a high resolution characterization of micro-textural features, mineral assemblage distribution gather evidence two microbial ore forming systems: Fe- Mn-oxidizing metabolic processes cyanobacterial activity Optical- cathodoluminescence rock microscopy, Fourier...
A combination of various techniques was applied to investigate the mineralogy Neoproterozoic Urucum iron and manganese deposit (Brazil) Carboniferous Permian carbonate deposits (China). The examined exhibited signs microbial mediation from Fe Mn bacteria cyanobacteria. studied samples showed diversity in their composition particle size. Probes revealed that rocks consist mainly hematite, showing substitution which reflects oxidation on active surface Fe-rich biomat. Nanominerals occurring...
The Araxá alkaline-carbonatitic Complex is located among the schists of Brasilia fold belt, on 125AZ (azimuth 125°) continental lineament, near São Francisco and Rio de la Plata Cratons. other intrusions Alto Paranaiba Igneous Province are in flexure region between Paraná basin, covered by basalt flows Serra Geral Group, Craton. Complex, approximately 4 km diameter, contains a core composed carbonate-magnetite phlogopitite, carbonate-phlogopite magnetitite, phlogopite-carbonate apatitite,...
O estudo de 12 amostras selecionadas filitos do Açungui revelou serem rochas com sericita, caulinita, quartzo e goethita, sem smectitas cloritas, localmente, zeólitas sódicas. Suas cores queima, entre creme claro marron escuro, são diretamente relacionadas aos teores Fe2O3. Seus médios são: SiO2 = 60,20%, Al2O3 22,33%, Fe2O3 6,27%, K2O 3,84%, Na2O 1,09% TiO2 0,78%. Têm S <760 ppm, Zr <187 Nb <41 Y <29 As <18 Pb <33 Cu <39 ppm Zn <47 ppm. Após desagregados, a...
Mesoscopic and microscopic analysis of the structural deformation underwent by Santa Terezinha Sequence led to recognition five different types emerald ore bodies, a. Complex folded body, generated substitution geological units deformed during Dn+2, Dn+3, Dn+4 events: b. Plane horizontalized Dn+3 events; c. verticalized mat fills tension faults anti-Riedel event; d. Pipe boat like restricted axial zones Fn+2 folds; e. Stratiform replacement some rocks hydrothermal fluids coming from faults....
The wide compositional band overlap of the Cambui and Floresta mines argillaceous facies preveni use chemical composition as indicator their origins. Despite this fact, main ore types have peculiarities, disseminated green is andesitic in composition, white from mine rhyolitic Mine dacitic. Rock also show that besides low depth evolution line represented by related to fractures, stockworks veins supergenic zones, displayed mineralogy, with strong K 2 O content variations, another exists,...
The most important kaolin deposits from Campo Alegre region (SC) were formed by the conjunction of at least one hydrothermal phase, followed several supergenic weathering phases. Possibly only these processes exist, but shall be small and smaller than those mined today. Besides kaolinization, illitization/muscovitization silicification, hydrothermalism also generated pyritized propilitized zones, with quartz + chlorite. Together, hypogenic alteration related to are very similar realted high...
The most important kaolin deposits from Campo Alegre region (SC) were formed by the conjunction of at least one hydrothermal phase followed many others weathering, supergenic, phases. Possibly only these processes exist, but shall be small and smaller than those mined today. Besides kaolinization, illitization/muscovitization silicification, hydrothermalism also generated pyritized propilitized zones, with quartz + chlorite. Together, hipogenic alterations related to are very similar high...
Veios de quartzo com ouro (MINEPAR) afloram na borda norte da bacia do Grupo Itajai, regiao Gaspar. Na sul, Ribeirao Prata, ha um deposito Pb-Zn-Cu. Ambos mostram relacionamento direto estruturas rigidas que afetam rochas Itajai. A analise estrutural das fraturas embasamento granulitico e cobertura sedimentar detritica, onde 44 veios Au, indica o minerio foi gerado em diferentes fases orogenese deformou primeira fase, uma compressao dirigida SE para NW reativou antigas falhas Esta gerou...